Vincent Demeester aac0a3ee13 Add before and since filter to images
Add support for two now filter on the `images` command : `before` and
`since`. They work the same as the one on the `ps` command but for
images.

        $ docker images --filter before=myimage
        # display all images older than myimage
        $ docker images --filter since=myimage
        # display all images younger than myimage

Signed-off-by: Vincent Demeester <vincent@sbr.pm>
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